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While stereotyped repetitions are frowned upon in literature, they serve a useful purpose in manual pages, because it is easier for the user to find certain information if it is always presented in the same way. For that reason, this commit harmonizes the varying formulations in the HISTORY section about which functions, flags, etc. were added in which OpenSSL version. It also attempts to make the pod files more grep friendly by avoiding to insert line breaks between the symbol names and the corresponding version number in which they were introduced (wherever possible). Some punctuation and typographical errors were fixed on the way. Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7854)
116 lines
3.3 KiB
Plaintext
116 lines
3.3 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY_sign_init, EVP_PKEY_sign - sign using a public key algorithm
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx);
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int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,
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unsigned char *sig, size_t *siglen,
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const unsigned char *tbs, size_t tbslen);
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=head1 DESCRIPTION
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The EVP_PKEY_sign_init() function initializes a public key algorithm
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context using key B<pkey> for a signing operation.
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The EVP_PKEY_sign() function performs a public key signing operation
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using B<ctx>. The data to be signed is specified using the B<tbs> and
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B<tbslen> parameters. If B<sig> is B<NULL> then the maximum size of the output
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buffer is written to the B<siglen> parameter. If B<sig> is not B<NULL> then
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before the call the B<siglen> parameter should contain the length of the
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B<sig> buffer, if the call is successful the signature is written to
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B<sig> and the amount of data written to B<siglen>.
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=head1 NOTES
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EVP_PKEY_sign() does not hash the data to be signed, and therefore is
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normally used to sign digests. For signing arbitrary messages, see the
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L<EVP_DigestSignInit(3)> and
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L<EVP_SignInit(3)> signing interfaces instead.
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After the call to EVP_PKEY_sign_init() algorithm specific control
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operations can be performed to set any appropriate parameters for the
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operation (see L<EVP_PKEY_CTX_ctrl(3)>).
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The function EVP_PKEY_sign() can be called more than once on the same
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context if several operations are performed using the same parameters.
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=head1 RETURN VALUES
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EVP_PKEY_sign_init() and EVP_PKEY_sign() return 1 for success and 0
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or a negative value for failure. In particular a return value of -2
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indicates the operation is not supported by the public key algorithm.
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=head1 EXAMPLE
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Sign data using RSA with PKCS#1 padding and SHA256 digest:
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#include <openssl/evp.h>
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#include <openssl/rsa.h>
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EVP_PKEY_CTX *ctx;
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/* md is a SHA-256 digest in this example. */
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unsigned char *md, *sig;
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size_t mdlen = 32, siglen;
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EVP_PKEY *signing_key;
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/*
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* NB: assumes signing_key and md are set up before the next
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* step. signing_key must be an RSA private key and md must
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* point to the SHA-256 digest to be signed.
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*/
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ctx = EVP_PKEY_CTX_new(signing_key, NULL /* no engine */);
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if (!ctx)
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/* Error occurred */
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if (EVP_PKEY_sign_init(ctx) <= 0)
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/* Error */
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if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
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/* Error */
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if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0)
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/* Error */
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/* Determine buffer length */
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if (EVP_PKEY_sign(ctx, NULL, &siglen, md, mdlen) <= 0)
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/* Error */
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sig = OPENSSL_malloc(siglen);
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if (!sig)
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/* malloc failure */
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if (EVP_PKEY_sign(ctx, sig, &siglen, md, mdlen) <= 0)
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/* Error */
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/* Signature is siglen bytes written to buffer sig */
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=head1 SEE ALSO
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L<EVP_PKEY_CTX_new(3)>,
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L<EVP_PKEY_CTX_ctrl(3)>,
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L<EVP_PKEY_encrypt(3)>,
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L<EVP_PKEY_decrypt(3)>,
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L<EVP_PKEY_verify(3)>,
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L<EVP_PKEY_verify_recover(3)>,
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L<EVP_PKEY_derive(3)>
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=head1 HISTORY
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These functions were added in OpenSSL 1.0.0.
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=head1 COPYRIGHT
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Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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